Package org.apache.lucene.search.spell

Class JaroWinklerDistance

java.lang.Object

org.apache.lucene.search.spell.JaroWinklerDistance

All Implemented Interfaces:

StringDistance

public class JaroWinklerDistance
extends java.lang.Object
implements StringDistance

Similarity measure for short strings such as person names.

See Also:

http://en.wikipedia.org/wiki/Jaro%E2%80%93Winkler_distance

Field Summary

Fields

Modifier and Type	Field	Description
private float	threshold

Constructor Summary

Constructors

Constructor	Description
JaroWinklerDistance()	Creates a new distance metric with the default threshold for the Jaro Winkler bonus (0.7)

Method Summary

Modifier and Type	Method	Description
boolean	equals(java.lang.Object obj)
float	getDistance(java.lang.String s1, java.lang.String s2)	Returns a float between 0 and 1 based on how similar the specified strings are to one another.
float	getThreshold()	Returns the current value of the threshold used for adding the Winkler bonus.
int	hashCode()
private int[]	matches(java.lang.String s1, java.lang.String s2)
void	setThreshold(float threshold)	Sets the threshold used to determine when Winkler bonus should be used.
java.lang.String	toString()

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

threshold

private float threshold

Constructor Detail

JaroWinklerDistance

public JaroWinklerDistance()

Creates a new distance metric with the default threshold for the Jaro Winkler bonus (0.7)

See Also:

setThreshold(float)

Method Detail

matches

private int[] matches(java.lang.String s1,
                      java.lang.String s2)

getDistance

public float getDistance(java.lang.String s1,
                         java.lang.String s2)

Description copied from interface: StringDistance

Returns a float between 0 and 1 based on how similar the specified strings are to one another. Returning a value of 1 means the specified strings are identical and 0 means the string are maximally different.

Specified by:

getDistance in interface StringDistance

Parameters:

s1 - The first string.

s2 - The second string.

Returns:

a float between 0 and 1 based on how similar the specified strings are to one another.

setThreshold

public void setThreshold(float threshold)

Sets the threshold used to determine when Winkler bonus should be used. Set to a negative value to get the Jaro distance.

Parameters:

threshold - the new value of the threshold

getThreshold

public float getThreshold()

Returns the current value of the threshold used for adding the Winkler bonus. The default value is 0.7.

Returns:

the current value of the threshold

hashCode

public int hashCode()

Overrides:

hashCode in class java.lang.Object

equals

public boolean equals(java.lang.Object obj)

Overrides:

equals in class java.lang.Object

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object